/Engine/Source/Runtime/AugmentedReality/Public/ARSystem.h
Add candidate image at runtime
True if it added the iamge successfully
bool OnAddRuntimeCandidateImage ( [UARSessionConfig](API\Runtime\AugmentedReality\UARSessionConfig) * SessionConfig, [UTexture2D](API\Runtime\Engine\Engine\UTexture2D) * CandidateTexture, [FString](API\Runtime\Core\Containers\FString) FriendlyName, float PhysicalWidth )